Negatives:
Unique vulnerability: The risers. If they have been brought to the correct length with great difficulty, they dissemble during wear, so that the backpack uncomfortable rocks repeatedly on his back. The belts slip again into the holder into that one out gets very difficult again.
Therefore only 3 star for an otherwise great backpack. For short distances, it is OK, who's more on the way, or even riding a bicycle, a model should choose with better straps.